First, you’ll need either a digital angle finder or a simple analog angle finder. The least expensive analog tool we found was at Harbor Freight (PN 34214, $4.95).

I had to single out this adjustable keyboard called the Protractor, because look at it! ... you can always find the right angle you had via the built-in angle finder.

We're testing the free Tremec Driveline Angle Finder app on our 1965 Chevrolet Chevelle, designed to find any annoying vibration in your car. ... It's cool because it is light and fully adjustable.